Automatic stop for elevators.



Patented .lune I2, |900. P. BUCHHEIT. AUTOMATIC STOP FOR' ELEVATORS.

(Application led Apr. 2, 1900.)

{Nu Model.)

. all!!! /ni/e fr Ell;

@MM @Wwf UNITED STATES rP irrmva Fries.

PETER BUOIIHEIT, or cIIIoAeo', ILLINOIS.

AUTOMATIC STOP FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 651,339, dated June 12, 1900. Application tiled April 2 1900. Serial No. 11,118. (No model.)

To all whom it may concern:

Be itknown that I, PETERBUCIIIIEIT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Stops for Elevators, of which the following isaspeciiication.

This invention relates to elevators, and has for its object the production of a mechanism, automatically operative, to prevent the fall of an elevator-car when the hoisting-cable breaks from any cause.

In the embodiment herein shown of this invention the hoisting cable of the elevator passes underneath two sheaves mounted on levers pivoted to the car. The usual guide on each side of the elevator-shaft is provided with teeth adapted to be engaged by dogs pivotally mounted on the elevator. The weight of the elevator-carsuspended upon the hoisting-cable, acting through a series of levers, holds said dogs from engaging said teeth. When the hoisting-cable breaks, suitably-arranged weights throw the dogs into engagement with said teeth and prevent the falling of the elevator-car.

In the accompanying drawings, Figure 1 is a front elevation of an elevator-car provided with this automatic stop, portions of the framework of the car being broken away to show the operating mechanism. Fig. 2 is a plan view of the upper beam of the elevatorcar, the idler-pulley being removed. Fig. 3 is a side elevation of an elevator-car, showing the stop mechanism, the guide-block E being removed.

Like letters of reference indicate corresponding parts throughout the several views.

In the construction of this elevator I provide the floor A, the side beams A', and the two-part top beam composed of the pieces A2 and A3. Midway of the length of said top beam I journal the idler-pulley A4 upon the shaft A5, passing through the two members A2 and A3 of the top beam. Adjusting-bolts A have a screw-thread engagement with the plates A", extending across the top of said members Af3 and A3 near the ends thereof.

B represents two levers mounted at their inner ends upon the pivot B. Each of said levers B is provided with a pair of upwardlyextending ears B2, and between each pair of car.

ears is journaled an idler-sheave B3, under each of which sheaves the hoisting-cable is intended to pass, said cable extending over the idler-pulley A4, journaledfbetweenvsaid sheaves B3 in the-top beam of the elevator- At their outer ends said levers B are provided with the recesses B4, and in each of said recesses B4 the hooked end of one of the vertical bars C is intended to rest. The bars C extend downward outside ot said side beams A ot' the elevator-car, each dividing in the two-part rods C, the said parts of which rods are connected together by the sleeves O2, internally screw-threaded with right and left threads for adjusting the length of the rod C.

D is a vertical guide for the elevator-car, fixed within the elevator-shaft on each side thereof and extending from the top to the bottom of said shaft. It is provided upon its face with the wedge-shaped projections D',

the upper part of which projections consti-` tute teeth D2, to be engaged by the stoppingdogs to be later described.

A guide-block E on each side of the elevator is secured to the side beams A of the car near the lower ends of said side beams, and these guide-blocks are arranged to embrace the vertical guides D. Each of said guide-blocks contains the two dogs E', pivotally mounted therein upon their bearings E2 and adapted to engage the teeth D2 of the vertical guide D in the elevator-shaft. Said dogs E have the integral rearwardlyextending weightlevers E3, upon which levers are mounted the slidable weights E4, having set-screws E5 for securing them in position upon the levers E3. Each of the downwardly-extending rods C has a pivotal connection by means of the bolt E6 with one of the weight-levers E3,

F is the hoisting-cable, extending from the winding-drum (not shown) and passing underneath the two idler-sheaves B5 and over the idler-pulley A4 in the top beam of the elevator-car. Both ends of the hoisting-cable may extend to the winding-drum, or one end may be lixed to a stationary support in the upper end of the elevator-shaft and only one end of the cable pass over the winding-drum.

In the normal operation of the mechanism the weight of the elevator-car is carried upon the idler-sheaves B3 and their pivoted supporting-levers B, said weight being practi- IOD cally balanced by an adjustment of the weights E4 on the weightlevers E3 of the dogs E'. The height to which said pivoted levers B may be raised is limited by the adj usting bolts A6 in the plates AT, and the position of the dogs E relative to the teeth D2 in the vertical guides D is adjusted by the threaded sleeves C2 on the two-part rods C. When the elevator operates normally, the cable F holds the pivoted levers B upward at their outer ends against the adjusting-bolts A, thereby holding the weight-levers E3 elevated and the dogs E out of engagement with the teeth D2 of the vertical guides D. If the cable F becomes slack, as by breaking, the pivoted levers B cease to suspend the weights E4, and the latter instantly drop, thrusting the dogs E into engagement with the lteeth D2 of the guides D in the elevator-shaft, preventing the car from falling. Springs may be u sed in the place ofthe Weigh ts E4,it` preferred.

I claim as my inventionl. In an elevator, in combination, a top beam; an idler-pulley journaled thereon; two levers pivotally connected to said top beam; a sheave rotatably mounted on each of said levers; two locking-dogs; and means for connecting each of said levers to one of said dcgs.

2. In an elevator, in combination, a top beam; an idler-pulley journaled thereon; two levers pivotally connected with said top beam; a sheave rotatably mounted on each of said levers; two pivoted locking-dogs, each having a Weight-lever; a Weight for each of said weight-levers and means for connecting each of said iirst-mentoned levers with one of said looking-dogs.

3. In an elevator, in combination, a top beam; an idler-pulleyjournaled thereon; two levers pivotallyconnccted with said top beam a sheave rotatably mounted on each of said levers; two pivoted locking-dogs, each having a weight-lever; a weight for each of said eight-levers; and two bifurcated rods, each having a pivotal engagement with one of said weight-levers, and an engagement with one of said rst-mentioned pivoted levers.

4. In an elevator, in combination, a top beam; an idler-pulley journaled thereon; two levers pivotally connected with said top beam; a sheave rotatably mounted on each of said levers; two pivoted locking-dogs at each side of the elevator; a weight-lever formed integral with each of said locking-dogs; a weight for each of said weight-levers; and a bifurcated rod at each side of the elevator, pivotally connected to said weight-levers on the same side of the elevator, and havinga hook engagement with the outer end of one of said first-mentioned levers.

5. In an elevator, in combination, a' top beam; an idler-pulley j ournaled thereon; two levers pivotallyconuected with said top beam; a sheave rotatably mounted on each of said levers; two pivoted locking-dogs at each side ot' the elevator; a weight-lever integral with each of said locking-dogs; a weight for each i of said Weight-levers a bifurcated rod on each side of the elevator, having a pivotal connection with each of the weight-levers on the same side of the elevator, and a hook connection with the outer end of one ot' said rstmentioned levers; means for adjusting the length of said bifurcated rod; and a bolt for each of said first-mentioned levers, forlimiting the movement thereof.

PETER DUCIIIIEIT. Witnesses:

GEO. L. CHINDAHL, L. L. MILLER. 

